Electric terminal



Sept. 18, 1928.- 1,684,383

J. AMON ELECTRIC TERMINAL Original Filed May 9, 1921 Pumas Sept. 18,1928. 1

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This invention relates to an electric ter-.

minal.

Such a terminal is particularly adapted for use in an electric heater havin a tubular jacket, although it may be for other sorted in the end of the tubular jacket of. an

electric heater and rigidly fastened thereto, the resistor being connected with the terminal. Among the objects of this invention 1s to m provide an ellicient and durable'electric terminal which may be readily and economically manufactured.

Another object is to provide improved means for fastening an electric terminal to a support.

Another object is to provide improved means for rigidly fastenin an electric terminal to the jacket of an e ectric heater.

Another object is to provide an electric terminal which will not become loose due to temrature changes.

Other objects and advantages will hereinafter ap ar.

The views in the accompanying drawings =3 are as follows:

Fi re 1 shows a terminal fastened to the tubu ar jacket of an electric heater.

Figure 2 shows a heater jacket and terminal ready for assembling.

Figure 3 is a longitudinal central section through the heater and terminal shown in i re 1.

igure 4 is a transverse section on line 4-4 of Figure 3.

Figure 5 is a transverse section on line 5-5 of Figure 3.

Figure 6 shows a modified form of bushing for fastening the terminal to the jacket.

Figures 1 to 5 will first be described.

A terminal 1, surrounded with insulation 2, over which is placed a bushing 3, is rigidly fastened to the tubular jacket 4 of an electric heater.

The terminal comprises in general an elonso gated tubular conductor arranged to receive the end of a helical resistor 5.

The insulation 2 may take the form of a sleeve of mica or other suitable material.

The bushing 3 may be made of copper or 66 other ductile materia pressed more readily when the jacket is oontracted thereon. y

Another and smaller ripli'eral groove 7 Y in the bushing 3 assists in fastening the ter-' minal to the jacket and prevents the longitudinal movement of the terminal with respect to the jacket. Of course, other means may be em oyed for preventin movement of the terminal with respect to t e jacket.

The resistor 5 connected with the terminal *1 is insulated from the jacket 4 by means of suitable insulating material such as, for example, granular magnesium-oxide.

The terminal with its insulating sleeve 2 and bushing 3 is inserted in the end of the jacket 4 whichis then swaged or otherwise contracted crosswise to rigidly fasten the terminal to the jacket.

The bushing 3 being of softer material than the jacket 4'is more readily compressed and thus prevents the jacket or terminal from being damaged while the terminal is being fastened to the jacket.

When the jacket is contracted on the bushing, the circular flanges thereof are comressed and the external diameter of the ushing is reduced.

The jacket is forced over the edges of the flanges and into the groove, as'shown in Figure 3, thus assistin in preventing longitudinal displacement o the terminal.

Figure 6 shows'a bushing having a helical peri heral groove.

hen the jacket is contracted on this bushing, the helical flange thereof is compressed thereby reducing the external diameter of the bushing. The jacket is forced over the edges 9 jacket. 4 I

2. Means for rigidly fastenin a plug terminal to the tubular jacket 0 heater, com rising a metallic bushing contracted on t e terminal and having a elical integral flange with which the jacket is interlocked by contraction of the'jacket thereon,

fastening beingeffected by contraction of the and means electrically separating the terminal and jacket.

3. An electric heating .unit comprising a metal tubular jacket, powdered heat refractory insulating material'within said jacket, a resistance conductor embedded in said insulating material, a terminal for said conductor, an insulating sleeve for said terminal having one end embedded in said insulating material, said terminaland sleeve projecting beyond said tubular jacket, and a metallic bushing inter osed between said insulating sleeve and jac et.

an electric tallic bushing jacket, a resistor mounted within said jacket and insulated therefrom, a terminal for said resistor having a part within said jacket and insulated therefrom, and a metallic bushing interposed between said 'acket and said part of said terminal, said j ac et being contracted to secure said bushing and and terminal therein.

6. An electric heating unitcomprising a metallic jacket, a resistor mounted therein and insulated therefrom, a terminal for said resistor projecting into said jacket, insulation surrounding said terminal, a ductile mesurrounding said insulation, said jacket being contracted about said bushing for securement of the same and said terminal.

7. An electric heater comprising a metallic jacket, a resistor mounted therein and insulated therefrom, a terminal for said resistor projectin within said jacket, and a ductile metallic bushing surroundin a portion of said terminal within said 'ac et and insulated from said terminal, said bushing having an. irregular surface, and said jacket being contracted about said bushing to interlock with said irregular surface of the latter.

In witness whereof, I have hereunto subscribed my name.

J OSEF AMON. 

